Transcript Clinical Effectiveness Of Contrast Sensitivity Function In Patients

Clinical Effectiveness Of Contrast
Sensitivity Function In Patients With
Primary Open Angle Glaucoma (POAG)
And Ocular Hypertension (OHT)
Under Guidance of
DR. VIDYA CHELERKAR MS, DNB
MOUSUMI SAIKIA
M.Optom, B.Optom
Chandraprabha Eye Hospital
Consulting Optometrist,
Orthoptics, Contact Lens & Low Vision Department
Academic In charge- Ridley College Of Optometry
PURPOSE AND OBJECTIVES
PURPOSE
• To investigate the correlation between visual acuity, visual
fields and contrast sensitivity in patients with primary open
angle glaucoma and ocular hypertension
OBJECTIVES
• To assess the contrast sensitivity and visual acuity
• To assess the retinal sensitivity in patients with glaucoma by
visual field testing
• To find out the relation of contrast sensitivity and mean
deviation of the visual field in patients with glaucoma
 Study Design:
Prospective, single centered, comparative
and hospital based study
39%
61%
Male
Female
 Place of Study:
H.V.Desai Eye hospital
Hadapsar, Pune; India
 Duration:
6 months –August 2010 to January 2011
SUBJECTS:
one twenty two
(122) eyes of
sixty one (61)
patients
GLAUCOMA OPD
POAG
IOP > 21 mm of
hg; C: D > 0.5;
visual field defect
GENERAL OPD
OHT
IOP > 21 mm of
hg with no other
signs
NORMAL
PATIENTS
Vision-refraction
unit
Slit lamp evaluation
IOP evaluation
Fundus
Examination
Gonioscopy
pachymetry
Contrast
sensitivity
Visual field test
STATISTICAL ANALYSIS
• All the data were evaluated and analyzed, using Microsoft excel
and descriptive statistical tool (Regression analysis) for statistical
analysis to determine the P-value to compares between the
variables:
-Correlation between visual
sensitivity(CS) in all groups
acuity(VA)
and
contrast
-Correlation between contrast sensitivity(CS) and Mean
Deviation(MD) in all groups
• By using 2 independent sample t-test Contrast sensitivity(CS) in
respect to all 3 groups
Graphical representation of mean
Correlation between Contrast Sensitivity
Contrast Sensitivity in control, Ocular (CS) and Mean Deviation (MD) :all
Hypertension (OHT) and POAG.
patients (n= 61) (number of eyes = 122)
Contrast Sensitivity vs Mean
Deviation
Mean Contrast Sensitivity
2
Mean
contrast
sensitivity
2
1.63
1.6
0
0
1.44
1.4
1.41
1.2
1
0.8
0.6
0.4
Mean Deviation
Contrast Sensitivity
1.8
1
0.5
1
1.5
-1
Mean
deviation
-2
-3
-4
-5
0.2
y = 7.0173x - 12.213
R² = 0.7698
-6
0
Control
Ocular
hypertension
Groups
2
POAG
-7
Contrast Sensitivity
CONCLUSION
• A positive correlation between decreases in contrast
sensitivity as measured by the Pelli-Robson chart and
the amount of visual field loss as indicated by the
mean deviation
• Contrast sensitivity test must be made as a mandatory
routine investigation for glaucoma diagnosis before
undergoing visual field test
THANK YOU